[Haskell-cafe] Unambiguous choice implementation

[Bartosz Milewski]

Thanks, Heinrich. I looked at the examples and at the references you
provided. I understand the semantic model, so I guess I'm mostly trying to
understand the implementation. Conal's paper was mostly about refining data
structures in order to provide better implementation. It's all beautiful up
to the point where he introduces the unamb hack. How did you manage to work
around this problem and implement event merging efficiently?
--Bartosz

On Mon, Jun 25, 2012 at 1:30 AM, Heinrich Apfelmus <
apfelmus at quantentunnel.de> wrote:

> Bartosz Milewski wrote:
>
>> I'm trying to understand Reactive Banana, but there isn't much
>> documentation to go about.
>>
>
> I haven't written any beginner documentation yet because the API is still
> in flux. The homepage
>
>  http://www.haskell.org/**haskellwiki/Reactive-banana<http://www.haskell.org/haskellwiki/Reactive-banana>
>
> and Stackoverflow
>
>  http://stackoverflow.com/**questions/tagged/frp<http://stackoverflow.com/questions/tagged/frp>
>
> are great resources, though. Feel free to drop me a line if you have
> questions as well.
>
>
>  How is RB positioned vis a vis Elliott (and then there is the earlier
>> Elliot and Hudak, and the later Elliot with the push implementation and
>> type classes).
>>
>
> The semantics from Elliott (double 't', by the way) and reactive-banana
> are essentially the same, but I have taken the liberty to modernize many
> function names. You can pretty much directly translate Conal's examples to
> reactive-banana, except for those involving the  switcher  combinator.
>
> The approaches to implementation are very different, though. Functional
> reactive programming is one of the cases where you have to learn the API
> without understanding its implementation. (But have a look at the
> Reactive.Banana.Model module, which provides a simplified model
> implementation.)
>
>
>  Do you have a toy applet that demonstrates the use of Reactive Banana,
>> something like Elliotts Bezier editor,  http://research.microsoft.com/**
>> pubs/69665/deop-tr.pdf<http://research.microsoft.com/pubs/69665/deop-tr.pdf> ?
>>
>
> Reactive-banana comes with a lot of examples, mentioned here:
>
>  http://www.haskell.org/**haskellwiki/Reactive-banana#**documentation<http://www.haskell.org/haskellwiki/Reactive-banana#documentation>
>
>
> By the way, Conal's Bezier editor doesn't make much use of the  switcher
>  combinator, so you can directly translate it into reactive-banana.
>
>
>
> Best regards,
> Heinrich Apfelmus
>
> --
> http://apfelmus.nfshost.com
>
>
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-- 
[:Bartosz:]
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